mtd: fsl_elbc_nand: set Nand flash page address to FBAR and FPAR correctly

If we use the Nand flash chip whose number of pages in a block is greater
than 64(for large page), we must treat the low bit of FBAR as being the
high bit of the page address due to the limitation of FCM, it simply uses
the low 6-bits (for large page) of the combined block/page address as the
FPAR component, rather than considering the actual block size.

Signed-off-by: Liu Shuo <b35362@freescale.com>
Signed-off-by: Jerry Huang <Chang-Ming.Huang@freescale.com>
Signed-off-by: Tang Yuantian <b29983@freescale.com>
Signed-off-by: Li Yang <leoli@freescale.com>
Acked-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

diff --git a/drivers/mtd/nand/fsl_elbc_nand.c b/drivers/mtd/nand/fsl_elbc_nand.c
index 7db573e9bf78e6d573521e97199a2e9f2147103f..d29479abe50441b009d83c0e5ce15a8f1e0bb668 100644 (file)
--- a/drivers/mtd/nand/fsl_elbc_nand.c
+++ b/drivers/mtd/nand/fsl_elbc_nand.c
@@ -166,15 +166,22 @@ static void set_addr(struct mtd_info *mtd, int column, int page_addr, int oob)
 
        elbc_fcm_ctrl->page = page_addr;
 
-       out_be32(&lbc->fbar,
-                page_addr >> (chip->phys_erase_shift - chip->page_shift));
-
        if (priv->page_size) {
+               /*
+                * large page size chip : FPAR[PI] save the lowest 6 bits,
+                *                        FBAR[BLK] save the other bits.
+                */
+               out_be32(&lbc->fbar, page_addr >> 6);
                out_be32(&lbc->fpar,
                         ((page_addr << FPAR_LP_PI_SHIFT) & FPAR_LP_PI) |
                         (oob ? FPAR_LP_MS : 0) | column);
                buf_num = (page_addr & 1) << 2;
        } else {
+               /*
+                * small page size chip : FPAR[PI] save the lowest 5 bits,
+                *                        FBAR[BLK] save the other bits.
+                */
+               out_be32(&lbc->fbar, page_addr >> 5);
                out_be32(&lbc->fpar,
                         ((page_addr << FPAR_SP_PI_SHIFT) & FPAR_SP_PI) |
                         (oob ? FPAR_SP_MS : 0) | column);